Fuse plug



PatenfdAug. 1, 1922 lNvENTOR A THnMAs F C ATTORNEY.

ww .M mmw WWK my@ T. F. COTE.

FUSE PLUG.

Prucmou mso SEPT. 2|. 1920.

UNITED s-TA'rEs PATENT omer.;

THOMAS r. cr; oF PRINCE ALBERT, SASKATCHEWAN, CANADA.

FUSE 4PLUG.

Speclcatlon oiLetters Patent. Putelltd Allgfl; 1922'.

Application, tiled` September 21, v1820. 4Serlnly No. 411,384).

y exact description oa the 'invent-ion, such as will enable others skilled in the srt to `which it apperteins to make and' use the same.

This invention relates to new and useful improvements in renewable fuse plugs and has for its primary object the provision of e device of the above stated character wherein a burnt or destroyed fuse element may be quickly and easily removed `and another substituted therefor so as to place the plug in condition for further use.

Another object of this invention is the provision of means for securing Vthe ends of the Vfuse elements to thel contacts of the plug which will prevent corroding or fusing of said contacts to the ends of the fuse elements when'the latter are blown out or destroyed.

A' further object of this invention is the provision of means for 'permitting the fumes or gases within the' plug to escape Awhen the fuse element blows outer is fused'.

A still further object'of thisl invention is the provision of a fuse plug ofthe. above stated character which willA be simple, durable and eiiieient, and whichmay bemannfactured and sold at a comparatively low cost.

With these and other objects in view `as will become more apparent as the description proceeds, the invention consists in certain novel features ofconstruction, combination, and arrangement of parts as will be hereinafter more fully described and claimed.

For a complete understanding.;r of my invention, reference is to be had to the following description and accompanying drewings,`

in which1 Figure 1 is a vertical sectional view illustrating a fuse plug constructed in accordance with my invention,

Figure 2 is an enlarged'sectonal view illistrating the cover for the body of the fuse u P ligure 3 is a detail View illustrating che fuse element,

Figure 4 is an enlarged sectional view illustrating the insulating sleeve,

Figure 5 is an enla-red detail view ofc closul'ecap or shell. y l

Referring 1n detail to the drawings, the

numeralV 1 indicates the body of the fuse plug and is constructed from porcelain or any other nnit'crial suitable lfor-the purpose end' which is of an insulating nature, and the body l hasorined upon its'outerinoo pressed screw threads 2 thattermnate short l `GIS of one end of said body so that the last named end .of the body willform a n er'grip 3 for threading the bodyinto' an out of a; shell 1. The end of the body whiclihas'the finger grip 3 is closed and provided with an opening 5 in which is securedAv a contact 6. Thevcontact 6 is provided with a. Han 7 that abuts the closed end of the body w "le the contact extends u wsirdl into the body and has a substantie y ova shaped end" 8'. The shell 4 is constructed from metal or any other materialfsuitable for the urpose and hns screwthreads Sl'vpressed in t e same for coo eration with the screw` threads 2 of thev ody 1' so that seid body can be readily threaded yinto theshell and bev firmly held therein. A cover 1()4 of insulating meteria! is sccurcdto the closed end ofthe shell `4 and is rovided with e vent 4opening l1.

The close( end of the shell '4 is elsoprovidedwith a vent opening that alinea-with the vent opening 11 sojthix'rt theumes within tliebod'y muy readily escape to 'the atmosphere-onthe fusing of the fuse; element.

A sleeve l2 of insulating materiel has each end open and receives a fuse element 13. The fuse element 13 has cut-out portions 14 adjacent each end sind the fuse element is bent at the cut-out portions to overlie the ends of the sleeve 12 and in o posits directions us clearly shown in t e drawings. Closure caps 15 are adapted to seal the'ends of the sleeve 12 and also retain the right angled ends of the fuseelements' in engage` mont with the ends of the sleeve. The closure caps 15 are of hollow formation and one of said closure caps is adapted to receive the substantially oval-shaped end of the contact 6 while the other closure cap engages the closed end of the shell 4, The sleeve 12 is provided with vent openings 16 at a. point intermediate its ends and which are adapted to permit the fumes or gases caused by the fusing of the fuse elements to escape from said sleeves into the body 1 whence they may escape from the body to the atmosphere by way of the vent opening 11.

From the foregoing description taken in connection with the accompanying.; drawings it will be noted that a fuse plug has been provided wherein the iasc element may be readily and quickly removed when fused by detaching the shell 4 from the body and removing the sleeve 12 from the body. After the removal of the sleeve 12 from the body, the closure caps 15 are removed -freeing the ends of the destroyed fuse elements and permitting a fuse element to rhe substituted in licu of the one destroyed. lt is also to be noted that the fumes or gases may readily esca e from the plug without any danger of lame escaping from the plug during the fusing of the fuse element.

The ventopening l1 in the cover 10 is surrounded by a recess 17 in which is positioned a disk 18 constructed of comparatively thin paper or similar material and on which is adapted to be 4printed the amperage of the fuse plug. This disk is adapted to prevent foreign matter from entering the interior of the body by way of the vent opening 1l and on the fusing of the fuse element, the cap will be destroyed or blown ofll indicating that the fuse element has been destroyed or fused.

While I have shown and described the preferred embodiment of my invention, it will be understood that minor changes in construction, combination, and arrangement of parts may be made without departing from the spirit and scope of the invention as claimed.

Having thus described my invention what I claim is 1. A fuse plu comprising a body having one end open an its other end closed, a. shell closing thel open end of said body, a contact secured in the closed end of said body and having a reduced inner end, an insulatingr sleeve in said body and spaced lroin the walls thereof and having:r each end open, a. 'fuse element having ont away portions at each end and having its ends bent at right angles in opposite directions to engage the ends of the sleeve and said fuse elements passing diagonally through the sleeve, closure caps closing the ends of the sleeve and securingr the ends of the fuse clement to the sleeve and one of said closure caps receiving the reduced end of the contact and the other closure cap engaging the shell, said sleeve having vent openings at a point intermediate its ends.

2. A inse plug comprising a body, a metallic shell secured to said body and having a vent opening, a contact carried by said body, a closure cap for said shell and. having' a vent opening, a fuse element connecting the contact and shell, said second named vent opening being surrounded by a recess, and a destructible disk located within said recess and closing the vent openings and adapted to bear the amperage of the fuse plug.

3. A fuse plug comprising a body, a shell for said body, a contact projecting into the body, an insulating sleeve in said body, a fuse element in said sleeve and having its ends disposed against the ends of the sleeve, and cup-shaped caps in the ends of the sleeve and having marginal flanges adapted to 'bind the ends of the fuse element against the sleeve, one of said caps enga-ging the shell and the other cap receiving a portion of the contact.

In testimony whereof I aix my signature in presence of two witnesses.

THOMAS F. COTE. Witnesses M. E. F LYNN, M. J. FLYNN. 

